Download Human Body Systems

Human Body Systems and Their Functions
Skeletal and Muscular Systems
 The skeleton is made up of 206 bones and provides support for
your body. It also protects your organs.
 Muscles pull the bones to produce movement. There are
voluntary, smooth, and cardiac muscles.
Circulatory System
 The circulatory system transports oxygen, nutrients, and wastes
through the body in the blood.
 Parts of the system: blood, heart, veins, and arteries
Respiratory System
 In the respiratory system, oxygen diffuses into the blood and
carbon dioxide diffuses out of the blood. Oxygen is taken in
from the air that you breathe.
 The lungs are the major organs of this system.
Digestive System
 The digestive system provides the nutrients your cells need to
produce energy by breaking down the food that you eat so it can
be used by the body.
 Digestion begins in the mouth. It continues in the esophagus. In
the stomach, digestive juices break down the food further.
Next, the food passes to the small intestine where it continues
to be broken down. Nutrients are absorbed by the body. In the
large intestine, water is removed from the food and taken to the
body. Any undigested food becomes waste.
Nervous System
 The nervous system controls all of the other body systems.
 The nervous system has two parts - the central nervous system,
made up of the brain and spinal cord, and the peripheral nervous
system which consists of sensory organs, such as the eyes, ears,
and body nerves.
 Nerves are bundles of neurons that carry signals from sensory
organs to the brain and from the brain to muscles.